
Interpretation: The possible orbitals in an atom should be determined.
Concept Introduction: The distribution of electrons in an atom is described by the use of quantum numbers used by the
The forth quantum number is spin quantum number which is denoted by symbol s and determined the spin of the electron if it is clockwise or anticlockwise.
The all four quantum numbers are explained in detail as follows:
Principal quantum number (n) determines the size of the orbital. The orbital with principal quantum number 2 is larger than the value 1. This also determines the energy of the orbital, as the value of n increases the energy of the orbital increases as its distance from the nucleus increases.
Angular quantum number (l) determined the shape of the orbital. For
The rules for the allowed quantum numbers combinations are as follows:
- All the three quantum numbers ( n, l and m ) describes the orbital of an atom and they are integers.
- The principal quantum number, n value cannot be zero. Thus, the values allowed for the principal quantum number are 1, 2, 3, 4, and so on.
- The value of angular quantum number, l can be between 0 to n-1. Thus, if value of n is equal to 3 the value of l can be 0, 1 or 2.
- The value of magnetic quantum number, m can be between − l to +l . Thus, if value of l is equal to 2, m can be wither -2, -1, 0, +1, or +2
For same number of principal quantum number, an orbital form a shell. The first character denotes the shell and the second identifies the sub-shell.
Here, for s orbital value of

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Chapter 5 Solutions
EBK BASIC CHEMISTRY
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